Setting the remote replication options

True Copy User Guide for VSP One Block
Version
10.4.x
Audience
anonymous
Part Number
MK-23VSP1B020-04

You can set storage system and CU options for Maximum initial copy activities, Blocked path monitoring, and Blocked path SIM monitoring.

Note: If iSCSI is used in a remote path, the blocked path monitoring remote replica option must be set to at least 40 seconds (default). If blocked path monitoring is less than 40 seconds, the path might be blocked due to a delay in the network such as many switches in a spanning tree protocol (STP) network or a long distance connection.
  1. Use the CCI raidcom modify remote_replica_opt command with -copy_activity number of activities to specify the number of volumes to be copied concurrently per initial copy operation.
    The range is from 1 to 512 volumes. The default is 64. The default setting might not limit the impact on performance, depending on your number of data paths, pairs, and so on. You should consider these factors when making a selection. When you change the maximum initial copy activities setting, the new setting applies to pairs created or resynchronized after the setting was changed, not to existing pairs.

    If the value is too large, the number of pending processing in a remote storage system increases, and the response time of a remote I/O for the update I/O might be affected. For example, if you set 64 for the maximum number of initial copy activities, and register 65 TrueCopy pairs, the local storage system starts creating the 64 pairs first. It does not start creating the 65th pair before one of the pairs is synchronized.

  2. Use the CCI raidcom modify remote_replica_opt command with -path_blocked_watch or -path_blocked_watch_sim to specify the number of seconds to monitor for blocked paths or to monitor for SIMs reported for blocked paths.
    For Blocked Path Monitoring, the range is 2-45 seconds, and the default is 40. For Blocked Path SIM Monitoring, the range is from 2 to 100 seconds.